There's readrate.com in Russian, I only know about it because it has some integration with PocketBook eReaders. Goodreads also offers integration with Kindle's

There's readrate.com in Russian, I only know about it because it has some integration with PocketBook eReaders. Goodreads also offers integration with Kindle's, newsletters with book recommendations or "discover a new book" service, and its ads are not very intrusive- what would you like more?